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A monitor is a class of relatively small warship that is lightly armoured, often provided with disproportionately large guns, and originally designed for coastal warfare. . The term "monitor" grew to include breastwork monitors, the largest class of riverine warcraft known as river monitors, and was sometimes used as a generic term for any turreted sh
In the 1860s and 1870s several nations built monitors that were used for coastal defense and took the name monitor as a type of ship. Those that were directly modelled on Monitor were low-freeboard, mastless, steam-powered vessels with one or two rotating, armoured turrets. The low freeboard meant that these ships were unsuitable for ocean ...
HMS Roberts was a Royal Navy Roberts-class monitor of the Second World War.She was the second monitor to be named after Field Marshal Frederick Roberts, 1st Earl Roberts.. Built by John Brown & Company, of Clydebank, she was laid down 30 April 1940, launched 1 February 1941 and completed on 27 October 1941.
HMS Abercrombie was a Royal Navy Roberts-class monitor of the Second World War. She was the second monitor to be named after General Sir Ralph Abercrombie. Abercrombie was built by Vickers Armstrong, Tyne. She was laid down on 26 April 1941, launched on 31 March 1942 and completed on 5 May 1943.
World War II all steel 56-foot (17 m)-long Landing Craft Mechanized (LCM-6s) were used as the basic hull to convert into 24 Monitors from 1966-1970. This was a separate US Navy Mobile Riverine Force from the Swift Boats (PCFs) and PBRs already operating in country.
The Vietnam monitors were divided into two programs; program 4 would consist of the 40 mm gun monitors, while the later program 5 would entail the eight Monitor (H) Howitzer versions, and the six Monitor (F) Flamethrower models. [4] All of the monitors were converted from World War II 56-foot (17 m) long Landing Craft Mechanized (LCMs) Mk 6s. [5]
The M15-class monitors were fourteen ships ordered in March 1915, as part of the War Emergency Programme of ship construction, mounting 9.2 inch Mk VI gun turrets removed from the Edgar-class and the Mk X turrets held in stock for the Drake-class and Cressy-class cruisers.
The ships would be armoured to a similar standard to the Abercrombie class, which were launched in April 1915. [10] Deck armour would range from 1 in (25 mm) on the forecastle , through 2 in (51 mm) on the upper deck and 4 in (102 mm) over the magazine and belt . [ 11 ]